Question

What is coagulation of lyophobic colloids?

Answer 1

Lyophobic colloids:

• Coagulation is the process of settling colloidal particles by induced aggregation caused by the presence of a suitable electrolyte.
• Lyophobic colloids are colloidal solutions where the dispersed phase has a low affinity for the dispersion medium.
• In Lyophilic sols coagulation two variables responsible for the stability of lyophilic sols.
• The charge and solvation of colloidal particles are two of these factors.
• A lyophilic sol can be coagulated if these two factors are removed.

Coagulation of lyophobic colloids can be done by following methods:

• By electrophoresis
• By mixing two oppositely charged sols
• By persistent dialysis
• By addition of electrolytes.